on a test VM, where I already have sogo3, doing an update I see:
sogo x86_64 3.2.6a.20170129-1.centos6 sogo3 22 M
sogo-activesync x86_64 3.2.6a.20170129-1.centos6 sogo3 129 k
sogo-ealarms-notify x86_64 3.2.6a.20170129-1.centos6 sogo3 12 k
sogo-tool x86_64 3.2.6a.20170129-1.centos6 sogo3 48 k
can you tell us how did you install? which command? from which repo?
can you try
yum --enablerepo=stephdl,sogo3,fws update
and tell us what you see?